CN110425016A - A kind of engine braking apparatus - Google Patents
A kind of engine braking apparatus Download PDFInfo
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- CN110425016A CN110425016A CN201910850882.3A CN201910850882A CN110425016A CN 110425016 A CN110425016 A CN 110425016A CN 201910850882 A CN201910850882 A CN 201910850882A CN 110425016 A CN110425016 A CN 110425016A
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- chamber
- rocker arm
- spring
- oil
- valve
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- 239000003921 oil Substances 0.000 claims abstract description 57
- 239000010721 machine oil Substances 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 230000000903 blocking effect Effects 0.000 claims abstract description 3
- 230000006835 compression Effects 0.000 description 9
- 238000007906 compression Methods 0.000 description 9
- 235000006040 Prunus persica var persica Nutrition 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 244000144730 Amygdalus persica Species 0.000 description 7
- 230000009471 action Effects 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008450 motivation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 240000005809 Prunus persica Species 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A kind of engine braking apparatus, its control mechanism is arranged in control chamber, including one-way control valve, the first spring, retaining ring, the one-way control valve has the second position for pushing the first position of the second oil circuit of unidirectional blocking by machine oil and being pushed the second oil circuit of unlatching by the first spring；Its executing agency is arranged in performs chamber, including adjusts bolt, shell, door, second spring, executes plunger, third spring；The plunger that executes has the 4th position for keeping the third place of certain brake clearance with sliding pin and capable of contacting with sliding pin and sliding pin being driven to realize braking.It the advantage is that the engine braking apparatus simple and stable structure, spaces compact does not influence engine whole height, and braking operation stability and high efficiency.
Description
Technical field
The present invention relates to a kind of medium and heavy diesel oil and natural gas engines, and in particular to a kind of engine braking apparatus.
Background technique
China mountain range is numerous, and mountain area area is vast, accounts for about the 69% of territory total area, heavy goods vehicle is in the long downhill path in mountain area
Section, driver frequently use service brake, and large energy can be absorbed in running brake in a short time, but with braking time
Increase, surface of friction pair temperature between brake drum and shoe brake increases, and coefficient of friction reduces, and ultimately causes brake efficiency
The decline even unsafe condition of brake failure cause major traffic accidents.In order to improve the driving safety of heavy type commercial automobile,
It needs to increase auxiliary braking system on the basis of service brake, to guarantee vehicle during descending with sustained
Brake force.
Automobile-used auxiliary braking system is broadly divided into two classes: retarder and engine braking system.Engine braking system by
It is used widely the advantages that its structure is simple, easy for installation, cheap.
Engine braking technology refers to that driver lifts accelerator pedal in vehicle traveling process, loosens the clutch, and utilizes hair
Generated resistance to compression pression and intake and exhaust resistance and frictional force are formed by braking masterpiece to driving wheel in motivation compression travel
With being allowed to brake automobile.Engine braking technology is divided into Compression Engine braking, deflation type engine braking and portion
Divide three kinds of deflation type engine braking.Compression Engine braking is to open exhaust valve or auxiliary gas near
Door；Deflation type engine braking is to open exhaust valve in entire cycle of engine；Part deflation type engine braking is to start
Most of stroke of machine circulation opens exhaust valve.The application of engine braking technology efficiently reduces using frequently for running brake
Rate, vehicle, using engine braking, can use braking at precipitous road surfaces such as lower long slope, rugged hill paths to avoid because of long-time
Device causes the temperature of brake bush to increase, and declines brake force or even ineffective.
Engine braking apparatus is capable of providing one or multiple auxiliary valve lifts, for realizing engine braking function
Energy.Have multiple patents of invention at present and be related to the application of technique, it includes additional one that major technique, which is outside the main lift of cam,
A or several auxiliary lifts can also increase a cam dedicated for braking according to the needs of engine operation and start mechanism
Dynamic device makes auxiliary lifts work and (realize engine braking function) or it is made not work.
Patent CN201080019296.1 is Jacobs Vehicle Systems Inc.'s application for engine braking and exhaust
The lost motion variable valve actuation system opened in advance, the system may include the first cam, and first cam has compression
Release projection part and prerelease door open convex portion, and the prerelease door is opened convex portion and is connected to first
On the hydraulic lost motion system of rocker arm.The piston of hydraulic way actuating can selectively extend from the hydraulic lost motion system, with
Compression release actuating is provided to the exhaust valve or prerelease door opens actuating.The piston of hydraulic way actuating can be used as
Relay piston in MS master-slave piston circuit is arranged in fixed shell, alternatively, slideably alternatively as hydraulic piston
It is arranged in rocker arm；Patent CN200910140026.5 is Man Nutzfahrzeuge AG's application with valve auxiliary control
The engine braking apparatus of unit processed and method for engine braking, the exhaust valve of the brake apparatus is by means of a packet
The mechanical bindiny mechanism for including a hydraulic valve Auxiliary Control Element is connected with camshaft.Hydraulic valve Auxiliary Control Element will
Exhaust valve is maintained on the position temporarily opened.Hydraulic valve Auxiliary Control Element can be by means of a master relative to internal combustion engine
The auxiliary oil return line of the additional setting of oil return line is switched on and off.
Structure is complicated for engine braking related patents described above, and associated component is more.
Summary of the invention
In order to overcome the shortcomings of that background technique, the present invention provide a kind of engine braking apparatus, mainly solve existing
The technical problems such as engine braking structure is complicated, reliability and durability difference in technology.
The technical solution adopted in the present invention: a kind of engine braking apparatus, including
Exhaust valve comprising first row valve, second row valve and cross at first row valve and the laterostigmatal gas of second row
The raft of pontoons；
Sliding pin is arranged in air valve bridge, and one end and first row valve contacts, the other end are pierced by air valve bridge；
Rocker arm shaft has the brake circuit to circulate for machine oil；
Camshaft is arranged in parallel with rocker arm shaft, and has the exhaust cam and auxiliary cam being adjacently positioned；
Exhaust rocker arm is rotatably installed on rocker arm shaft, front end with air valve bridge is corresponding contacts, its rear end and exhaust cam
Corresponding contact；
Auxiliary rocker arm is rotatably installed on rocker arm shaft, and is disposed adjacent with exhaust rocker arm, its rear end and auxiliary cam phase
It is corresponding, control chamber, performs chamber and the first oil circuit and the company that are connected to brake circuit and control chamber are additionally provided on the auxiliary rocker arm
Second oil circuit of logical control chamber and performs chamber, the performs chamber is located at auxiliary rocker arm front end and its lower ending opening is opposite with sliding pin
It answers；
Auxiliary rocker arm can be pushed down and is kept in contact with auxiliary cam by elastic element；
Control mechanism is arranged in control chamber comprising one-way control valve, the first spring, retaining ring, the one-way control valve are living
Dynamic to be arranged in control chamber, the opening that control chamber is arranged in the retaining ring goes out, and the first spring setting is in retaining ring and unidirectional control
Between valve processed, the one-way control valve, which has, pushes the first position of the second oil circuit of unidirectional blocking by machine oil and by the first spring
Push the second position for opening the second oil circuit；
Executing agency is arranged in performs chamber comprising adjusts bolt, shell, door, second spring, executes plunger, third
Spring；The adjusting bolt setting penetrates in performs chamber on auxiliary rocker arm, and from top to bottom；The shell is arranged in performs chamber
It is interior, it is equipped with lower ending opening and cunning chamber in the shape of a " convex ", outer surface is equipped with the oil groove being circumferentially arranged, and the oil groove and the
Two oil circuits are corresponding, and the oilhole of connection oil groove and sliding chamber top is additionally provided on the shell；The door is arranged under performs chamber
At end opening, the second spring is arranged between door and shell, and housing upper surface is driven to offset with bolt is adjusted；It is described to hold
Row plunger is in T-shaped, and setting is intracavitary in cunning, and the convex shoulder of the upper end and sliding chamber limits cooperation, and lower end is pierced by door and cunning
Sell corresponding；The third spring, which is set in, to be executed outside plunger, and both ends offset respectively at execution plunger, door, can be driven and be held
Row upper end face and the convex shoulder of sliding chamber offset；The plunger that executes has the third place that certain brake clearance is kept with sliding pin
And the 4th position that can be contacted with sliding pin and sliding pin is driven to realize braking.
The executing agency further includes baffle ring, and the baffle ring setting is in sliding chamber open lower end, and the convex shoulder with execution plunger
Limit cooperation.
Locking nut is additionally provided with outside the adjusting bolt.
The control chamber is arranged in parallel with respect to rocker arm shaft.
The control chamber is vertically arranged with respect to rocker arm shaft, and in the same plane with performs chamber arrangement.
The working principle of above-mentioned engine braking apparatus is as follows:
When engine work, the brake circuit inorganic oil in rocker arm shaft circulates, work of the one-way control valve in the first spring
It is in the second position with lower, the execution plunger is in the third place under the action of third spring, executes plunger and cunning at this time
Pin keeps certain brake clearance, therefore the lift of auxiliary cam does not work, and will not influence the proper motion of exhaust valve, guarantees hair
Motivation works normally.
When the work of above-mentioned engine braking apparatus, the electronic control unit of engine issues instruction, and solenoid valve is opened, made
Obtaining machine oil can be flowed into the brake circuit of rocker arm shaft, and the machine oil in brake circuit enters control chamber by the first oil circuit
It is interior, push one-way control valve that the elastic force of the first spring is overcome to act, and be moved to first position, then machine oil is through unidirectionally controlled
Valve, the second oil circuit enter in performs chamber, the machine oil in performs chamber then passes through oil groove, oilhole enter shell cunning it is intracavitary, push away
The dynamic plunger that executes overcomes the elastic force of third spring to move downward and is in the 4th position, at this point, executing between plunger and sliding pin
Brake clearance be eliminated, under the driving of auxiliary cam, in engine compression strokes near top dead center, execute plunger and push and slide
Pin opens exhaust valve, realizes engine braking.
When above-mentioned engine braking apparatus does not work, the electronic control unit of engine issues instruction, and solenoid valve is closed,
The brake circuit inner engine oil pressure of rocker arm shaft declines or is released by solenoid valve, and one-way control valve restores under the action of the first spring
To the second position, while the second oil circuit is opened, and execution plunger moves up under the action of third spring resets to third position
It sets, sliding intracavitary machine oil is released through oilhole, oil groove, the second oil circuit, and plunger is executed at this time and sliding pin keeps certain brake clearance, because
The lift of this auxiliary cam does not work, and will not influence the proper motion of exhaust valve, guarantees engine work.
The beneficial effects of the present invention are: using above scheme, engine braking apparatus simple and stable structure, spaces compact,
Engine whole height, and braking operation stability and high efficiency are not influenced.
Detailed description of the invention
Fig. 1 is the schematic view of the front view of engine braking apparatus of the embodiment of the present invention.
Fig. 2 is the sectional perspective structural schematic diagram of engine braking apparatus of the embodiment of the present invention.
Fig. 3 is the cross-sectional view of engine braking apparatus of the embodiment of the present invention.
Fig. 4 is the cross-sectional view of auxiliary rocker arm and control mechanism when control mechanism of the embodiment of the present invention is in the second position.
Fig. 5 is the cross-sectional view of auxiliary rocker arm and executing agency when executing agency of the embodiment of the present invention is in the third place.
Fig. 6 is the cross-sectional view of auxiliary rocker arm and control mechanism when control mechanism of the embodiment of the present invention is in first position.
Fig. 7 is the cross-sectional view of auxiliary rocker arm and executing agency when executing agency of the embodiment of the present invention is in four positions.
Fig. 8 is the schematic perspective view of auxiliary rocker arm of the embodiment of the present invention.
Fig. 9 is the cross-sectional view 1 of auxiliary rocker arm of the embodiment of the present invention.
Figure 10 is the cross-sectional view 2 of auxiliary rocker arm of the embodiment of the present invention.
Figure 11 is the structural schematic diagram of shell of the embodiment of the present invention.
Figure 12 is the cross-sectional view of shell of the embodiment of the present invention.
Figure 13 is another embodiment of the present invention auxiliary rocker arm, control mechanism and the cross-sectional view of executing agency.
Figure 14 is the structural schematic diagram of another embodiment of the present invention auxiliary rocker arm.
Specific embodiment
Embodiments of the present invention is further illustrated with reference to the accompanying drawing:
As shown, a kind of engine braking apparatus, including exhaust valve 1, sliding pin 2, rocker arm shaft 3, camshaft 4, exhaust rocker arm 5,
Auxiliary rocker arm 6, elastic element 7, control mechanism 8, executing agency 9.
The exhaust valve 1 is including first row valve 11, second row valve 12 and crosses at first row valve 11 and second
Air valve bridge 13 on exhaust valve 12, first row valve 11 and second row valve 12 are all made of mushroom valve, for controlling engine
The flowing of gas between inner combustion chamber and intake and exhaust manifold.
The sliding pin 2 is arranged in air valve bridge 13, and one end is contacted with first row valve 11, and the other end is pierced by air valve bridge
13, when the active force sufficiently large by one of sliding pin 2, first row valve 11 will be pushed to act, realize first row valve 11
Exhaust stroke.
The rocker arm shaft 3 is arranged in parallel with camshaft 4, have on the camshaft 4 exhaust cam 41 that is adjacently positioned with
Auxiliary cam 42,4 rotational energy of camshaft drive exhaust cam 41 and auxiliary cam 42 to rotate simultaneously.
The exhaust rocker arm 5 is rotatably installed on rocker arm shaft 3, and the front end of the exhaust rocker arm 5 and air valve bridge 13 are right
It should contact, rear end is contacted with the correspondence of exhaust cam 41, therefore with the rotation of camshaft 4, exhaust rocker arm 5 can be in exhaust cam
41 under the collective effect of exhaust valve 1 around 3 rotary oscillation of rocker arm shaft, to can be realized by exhaust cam 41, exhaust rocker arm 5
The exhaust stroke of exhaust valve 1.
Wherein, the first idler wheel 51, first idler wheel 51 and row are installed by the first roller shaft in 5 rear end of exhaust rocker arm
Gas cam 41 is in contact, and rolls cooperation due to being formed between exhaust cam 41 and the first idler wheel 51, greatly reduces exhaust
Frictional force between cam 41 and exhaust rocker arm 5 reduces abrasion, improves service life.
5 front end of exhaust rocker arm is additionally provided with adjustment bolt 53, image angle 52, fastening nut 54, and the image angle 52 passes through special
The lower end of adjustment bolt 53 is fitted in tool, and image angle 52 can be freely rotated in certain corner, in the adjustment bolt 53
End is prominent from the top of 5 front end of exhaust rocker arm, and is locked by fastening nut 54, connect it is stronger reliable, it is described as
Angle 52 is in contact with air valve bridge 13, since the freedom degree of image angle 52 is higher, with the wobbling action of exhaust rocker arm 5, and guarantee and gas
The contact effect of the raft of pontoons 13 guarantees the operation is stable.
The auxiliary rocker arm 6 is rotatably installed on rocker arm shaft 3, and is disposed adjacent with exhaust rocker arm 5, its rear end with it is auxiliary
It helps cam 42 corresponding, and is pushed down by elastic element 7 and be in contact with auxiliary cam 42, therefore when the rotation of camshaft 4, assist convex
Wheel 42 is able to drive auxiliary rocker arm 6 along 3 rotary oscillation of rocker arm shaft.
Likewise, the second idler wheel 65, second rolling can be installed by the second roller shaft in 6 rear end of auxiliary rocker arm
Wheel 65 is contacted with auxiliary cam 42, is formed between auxiliary cam 42 and the second idler wheel 65 and is rolled cooperation, and it is convex to greatly reduce auxiliary
Frictional force between wheel 42 and auxiliary rocker arm 6 reduces abrasion, improves service life.
Wherein, the auxiliary cam 42 includes being arranged two in basic circle and one or two peaches, such as the present embodiment
A peach respectively includes a braking peach and an EGR peach or a BGR peach, and braking peach is for providing
One braking lift, optional EGR peach can provide an EGR lift when engine makees positive work, and optional BGR peach can be
One BGR lift is provided when engine braking.
In addition, elastic element 7 also has many selectable modes, in the present embodiment, elastic element 7 uses spring,
One end is fixed on the rear end of auxiliary rocker arm 6, and the other end is fixed on spring(-supported) mount (being not drawn on figure), and spring(-supported) mount is fixed on engine
On cylinder cap or other components fixed, in engine working process, there is elastic element 7 enough spring forces to keep engine auxiliary
Rocker arm 6 is helped to be in contact with auxiliary cam 42 always.
Certainly, in engine working process, auxiliary rocker arm 6 can by the other modes such as such as leaf spring, torsional spring keep with
The contact of auxiliary cam 42.
The rocker arm shaft 3 has the brake circuit 31 to circulate for machine oil, and solenoid valve is arranged (in figure not on the brake circuit 31
Draw), and solenoid valve is then controlled by the electronic control unit of engine, when electronic control unit receives brake signal, then
It controls solenoid valve to open, machine oil can be entered in brake circuit 31 by solenoid valve, when electronic control unit receives stopping
When the signal of braking, then solenoid valve closing is controlled, machine oil just cannot be introduced into brake circuit 31.
Control chamber 61, performs chamber 62, the first oil circuit 63, the second oil circuit 64 are additionally provided on the auxiliary rocker arm 6.
The front position of auxiliary rocker arm 6 is arranged in the performs chamber 62, and opposite rocker arm shaft 3 is vertically arranged, and lower end is opened
Mouth setting is corresponding with sliding pin 2.
The control chamber 61 can be arranged in parallel with respect to rocker arm shaft 3, can also be vertically arranged with respect to rocker arm shaft 3, and with hold
An actor's rendering of an operatic tune 62 arranges the control chamber 61 setting open at one end in the same plane.
First oil circuit 63 is connected to brake circuit 31 and control chamber 61, and it is connected to the end position of control chamber 61,
Second oil circuit 64 is then connected to control chamber 61 and performs chamber 62, and it is connected to the sidewall locations of control chamber 61.
The control mechanism 8 is arranged in control chamber 61 comprising one-way control valve 81, the first spring 82, retaining ring 83, institute
One-way control valve 81 to be stated to be slidably arranged in control chamber 61, the opening that control chamber 61 is arranged in the retaining ring 83 goes out, and described first
Spring 82 is arranged between retaining ring 83 and one-way control valve 81, when organic oil is entered by the first oil circuit 63 in brake circuit 31
When in control chamber 61, it will push one-way control valve 81 and the elastic force of the first spring 82 overcome to slide into first position, work as braking
In oil circuit 31 when inorganic oil, the first spring 82 then will push one-way control valve 81 and be reset to the second position.
Wherein one-way control valve 81 is formed with end import, lateral outlet for the runner of flow of media, and sets in the runner
There is one-way sealing component, when one-way control valve 81 is in first position, lateral outlet is just corresponding with the second oil circuit 64, because
This machine oil can be entered in performs chamber 62 by one-way control valve 81, the second oil circuit 64, and the machine oil being performed simultaneously in chamber 62 can not
Reflux, it is whole to be separated with the second oil circuit 64 when one-way control valve 81 is in the second position, it enables in performs chamber 62
Machine oil is back in control chamber 61 by the second oil circuit 64 and realizes draining.
The executing agency 9 is arranged in performs chamber 62 comprising adjusts bolt 91, shell 92, door 93, second spring
94, plunger 95, third spring 96 are executed.
The adjusting bolt 91 is arranged on auxiliary rocker arm 6, and is penetrated in performs chamber 62 from top to bottom, and the shell 92 is set
It sets in performs chamber 62, is equipped with lower ending opening and cunning chamber 921 in the shape of a " convex ", outer surface is equipped with the oil groove being circumferentially arranged
922, and the oil groove 922 is corresponding with the second oil circuit 64, is additionally provided on connection oil groove 922 and sliding chamber 921 on the shell 92
The oilhole 923 in portion；The door 93 is arranged at 62 lower ending opening of performs chamber, and the second spring 94 is arranged in door 93 and shell
Between body 92,92 upper surface of shell is driven to offset with bolt 91 is adjusted, the execution plunger 95 is in T-shaped, and is arranged in cunning
In chamber 921, the convex shoulder of the upper end and sliding chamber 921, which limits, to be cooperated, and it is corresponding with sliding pin 2 that lower end is pierced by door 93；The third
Spring 96, which is set in, to be executed outside plunger 95, and both ends offset respectively at execution plunger 95, door 93, can be driven and be executed on plunger 95
End face and the convex shoulder of sliding chamber 921 offset.
When inorganic oil in brake circuit 31, plunger 95 is executed under the promotion of third spring 96, the convex shoulder with sliding chamber 921
It offsets, is in the third place, when organic oil is entered in control chamber 61 by the first oil circuit 63 in brake circuit 31, can push away
Dynamic one-way control valve 81 overcomes the elastic force of the first spring 82 to slide into first position, and the machine oil in control chamber 61 will lead at this time
Cross one-way control valve 81, the second oil circuit 64 enters in performs chamber 62, sliding chamber is then entered by oil groove 922, oilhole 923
In 921, push execution plunger 95 that the elastic force of third spring 96 is overcome to slide into the 4th position.
When execution plunger 95 is in the third place, certain brake clearance, therefore the liter of auxiliary cam are kept with sliding pin 2
Journey does not work, and will not influence the proper motion of exhaust valve, when execution plunger 95 is in four positions, between sliding pin 2
Spacing become smaller, brake clearance eliminate, therefore, under the driving of auxiliary cam, in engine compression strokes near top dead center, hold
Row plunger pushes sliding pin to open exhaust valve.
In addition, can be realized 92 position of shell by the adjusting bolt 91, shell 92, door 93 and second spring 94
Trace regulation, and then realize that the spacing executed between plunger 95 and sliding pin 2 adjusts.Wherein, it is also set outside the adjusting bolt 91
There is locking nut 98, it is ensured that adjusting bolt 91 will not loosen, and structure is more stable.
The executing agency 9 can also include baffle ring 97, the baffle ring 97 setting in sliding 921 open lower end of chamber, and with hold
The convex shoulder of row plunger 95 limits cooperation, is limited by 97 pairs of execution plungers 95 of baffle ring, it is ensured that will not be because of machine oil hydraulic pressure
It is excessive, cause the problem of executing excessive plunger sliding or damage third spring 96.
The working principle of above-mentioned engine braking apparatus is as follows:
When engine work, 31 inorganic oil of brake circuit in rocker arm shaft 3 circulates, and one-way control valve 81 is in the first spring
The second position is under the action of 82, the execution plunger 95 is in the third place under the action of third spring 96, holds at this time
Row plunger 95 and sliding pin 2 keep certain brake clearance, therefore the lift of auxiliary cam does not work, and will not influence exhaust valve just
Often movement guarantees engine work.
When the work of above-mentioned engine braking apparatus, the electronic control unit of engine issues instruction, and solenoid valve is opened, made
Obtaining machine oil can be flowed into the brake circuit 31 of rocker arm shaft 3, and the machine oil in brake circuit 31 is entered by the first oil circuit 63
In control chamber 61, push one-way control valve 81 that the elastic force of the first spring 82 is overcome to act, and be moved to first position, then machine
Oil enters in performs chamber 62 through one-way control valve 81, the second oil circuit 64, and the machine oil in performs chamber 62 then passes through oil groove 922, oil
Hole 923 enters in the cunning chamber 921 of shell 92, and execution plunger 95 is pushed to overcome the elastic force of third spring 96 to move downward and locate
In the 4th position, at this point, the brake clearance executed between plunger 95 and sliding pin 2 is eliminated, under the driving of auxiliary cam, sending out
Motivation compression stroke near top dead center executes plunger and sliding pin is pushed to open exhaust valve, realizes engine braking.
When above-mentioned engine braking apparatus does not work, the electronic control unit of engine issues instruction, and solenoid valve is closed,
The 31 inner engine oil pressure of brake circuit of rocker arm shaft 3 declines or is released by solenoid valve, work of the one-way control valve 81 in the first spring 82
It is restored to the second position under, while the second oil circuit 64 is opened, executes plunger 95 under the action of third spring 96 to moving up
Dynamic to reset to the third place, the machine oil in sliding chamber 921 is released through oilhole 923, oil groove 922, the second oil circuit 64, executes plunger at this time
95 keep certain brake clearance with sliding pin 2, therefore the lift of auxiliary cam does not work, and will not influence the normal fortune of exhaust valve
It is dynamic, guarantee engine work.
In the description of the present invention, it should be noted that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or two
More than.
Every technical staff's notice: of the invention although the present invention is described according to above-mentioned specific embodiment
Invention thought be not limited in the invention, any repacking with inventive concept will all be included in this patent protection of the patent right
In range.
Claims (5)
1. a kind of engine braking apparatus, including
Exhaust valve (1) comprising first row valve (11), second row valve (12) and cross at first row valve (11) and the
Air valve bridge (13) on two exhaust valves (12)；
Sliding pin (2), setting is in air valve bridge (13), and one end is contacted with first row valve (11), and the other end is pierced by air valve bridge
(13)；
Rocker arm shaft (3) has the brake circuit (31) to circulate for machine oil；
Camshaft (4) is arranged in parallel with rocker arm shaft (3), and has the exhaust cam (41) and auxiliary cam being adjacently positioned
(42)；
Exhaust rocker arm (5) is rotatably installed on rocker arm shaft (3), and front end is contacted with air valve bridge (13) correspondence, its rear end
It is contacted with exhaust cam (41) correspondence；
Auxiliary rocker arm (6) is rotatably installed on rocker arm shaft (3), and is disposed adjacent with exhaust rocker arm (5), its rear end with
Auxiliary cam (42) is corresponding, and control chamber (61), performs chamber (62) and connection brake oil are additionally provided on the auxiliary rocker arm (6)
Road (31) is with the first oil circuit (63) of control chamber (61) and is connected to the second oil circuits (64) of control chamber (61) Yu performs chamber (62), institute
State that performs chamber (62) is located at auxiliary rocker arm (6) front end and its lower ending opening is corresponding with sliding pin (2)；
Auxiliary rocker arm (6) can be pushed down and be kept in contact with auxiliary cam (42) by elastic element (7)；
It is characterized by also including
Control mechanism (8), setting is in control chamber (61) comprising one-way control valve (81), the first spring (82), retaining ring
(83), the one-way control valve (81) is movably arranged in control chamber (61), and the retaining ring (83) is arranged in control chamber (61)
It is open out, first spring (82) is arranged between retaining ring (83) and one-way control valve (81), the one-way control valve (81)
The second oil of unlatching is pushed with the first position for being pushed the second oil circuit of unidirectional blocking (64) by machine oil and by the first spring (82)
The second position on road (64)；
Executing agency (9), setting is in the performs chamber (62) comprising adjusts bolt (91), shell (92), door (93), the
Two springs (94) execute plunger (95), third spring (96)；The adjusting bolt (91) is arranged on auxiliary rocker arm (6), and from
It is penetrated under in performs chamber (62)；Shell (92) setting is equipped with lower ending opening and is in " convex " in performs chamber (62)
The cunning chamber (921) of font, outer surface are equipped with the oil groove (922) being circumferentially arranged, and the oil groove (922) and the second oil circuit (64)
It is corresponding, the oilhole (923) of connection oil groove (922) and sliding chamber (921) top is additionally provided on the shell (92)；The door
(93) it is arranged at performs chamber (62) lower ending opening, the second spring (94) is arranged between door (93) and shell (92),
Shell (92) upper surface is driven to offset with bolt (91) are adjusted；The execution plunger (95) is in T-shaped, and is arranged in sliding chamber
(921) in, the convex shoulder of the upper end and sliding chamber (921), which limits, to be cooperated, and it is corresponding with sliding pin (2) that lower end is pierced by door (93)；Institute
It states third spring (96) and is set in execution plunger (95) outside, both ends offset respectively at execution plunger (95), door (93), can drive
Make to execute plunger (95) upper surface and the convex shoulder of sliding chamber (921) offsets；The execution plunger (95), which has, keeps one with sliding pin (2)
The 4th position for determining the third place of brake clearance and capable of being contacted with sliding pin (2) and sliding pin (2) being driven to realize braking.
2. engine braking apparatus according to claim 1, it is characterised in that: the executing agency (9) further includes baffle ring
(97), baffle ring (97) setting is in sliding chamber (921) open lower end, and limits and cooperate with the convex shoulder for executing plunger (95).
3. engine braking apparatus according to claim 1, it is characterised in that: be additionally provided with lock outside the adjusting bolt (91)
Tight nut (98).
4. engine braking apparatus according to claim 1, it is characterised in that: the control chamber (61) is with respect to rocker arm shaft
(3) it is arranged in parallel.
5. engine braking apparatus according to claim 1, it is characterised in that: the control chamber (61) is with respect to rocker arm shaft
(3) it is vertically arranged, and in the same plane with performs chamber (62) arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910850882.3A CN110425016A (en) | 2019-09-10 | 2019-09-10 | A kind of engine braking apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910850882.3A CN110425016A (en) | 2019-09-10 | 2019-09-10 | A kind of engine braking apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110425016A true CN110425016A (en) | 2019-11-08 |
Family
ID=68418862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910850882.3A Withdrawn CN110425016A (en) | 2019-09-10 | 2019-09-10 | A kind of engine braking apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110425016A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852606A (en) * | 2020-08-18 | 2020-10-30 | 浙江黎明智造股份有限公司 | Modular engine hydraulic braking device |
| CN112065525A (en) * | 2020-09-09 | 2020-12-11 | 潍柴动力股份有限公司 | Rocker arm mechanism and engine assembly |
| CN112065524A (en) * | 2020-09-11 | 2020-12-11 | 潍柴动力股份有限公司 | Rocker arm assembly and engine |
| CN114901926A (en) * | 2020-01-15 | 2022-08-12 | 伊顿智能动力有限公司 | Gap setting features for castellated structures |
-
2019
- 2019-09-10 CN CN201910850882.3A patent/CN110425016A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114901926A (en) * | 2020-01-15 | 2022-08-12 | 伊顿智能动力有限公司 | Gap setting features for castellated structures |
| US11859519B2 (en) | 2020-01-15 | 2024-01-02 | Eaton Intelligent Power Limited | Lash setting features for castellation mechanism |
| CN111852606A (en) * | 2020-08-18 | 2020-10-30 | 浙江黎明智造股份有限公司 | Modular engine hydraulic braking device |
| CN112065525A (en) * | 2020-09-09 | 2020-12-11 | 潍柴动力股份有限公司 | Rocker arm mechanism and engine assembly |
| US11891924B2 (en) | 2020-09-09 | 2024-02-06 | Weichai Power Co., Ltd. | Rocker arm mechanism and engine assembly |
| CN112065524A (en) * | 2020-09-11 | 2020-12-11 | 潍柴动力股份有限公司 | Rocker arm assembly and engine |
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Application publication date: 20191108 |
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